Electric switch.



C. BRAMMING.

ELECTRIC SWITCH.

APPLICATION FILED FEB. 19. 1911.

Patented Apr. 16, 1918.

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UNITED PATENT OFFICE.

CARL BRAMMING, OF CHICAGO, ILLINOIS, ASSIGNQR TO ACCESSORIES MANUFACTURING COMPANY, A CORPORATION OF ILLINOIS.

ELECTRIC SWITCH.

Specification of Letters Patent.

rammed Apr. 16, 1918.

To all whom it may concern:

lie it known tha t l. (Ami lhmanumo, a citizen of the l nited States, and resident of Chicago. county of Cook. and State of Illinois, have invented certain new and useful Improvements in Electric Switches, of which the following is a specification. and which are illustrated in the acemnpanying drawings, forming a part thereof.

The invention relates to in'iprovemcnts in electric switches of the single push button type. The ohjects of the invention are to sceure simplicity of operation and reliability of action in a simple and (Ollitlultt deiice.

tine elnhodinwnt of the intention hem inat'ter desrrihed and is illustrated in the accompanying drawings, in which-- Figure l is a side view of the switch;

Figs. 2 and 3 are. sectional views on lines 2---2 and 2%3, respectively;

Fig. 4 is an end view of the switch looking at the hotton'i of Fig.1; and

Fig. 5 is a detail of the actuating plunger.

The casing 38 takes the form of a U- shaped plate apertured in its cross-member to receive the push button 39, such member being provided with laterally apertured lugs 4U, 41. providing means for securing the switch within a suitable support, the ends of the side members of the plate 38 being bent outwardly and. loaelnvardl to form lugs 42, 43. to which are secured a pair of insulating plates 44, 45.

T he rod to is spiral at its uppe end 47, this portion playing within a complementary slot in a plate 48 secured to the inner end of the push button, the lower end of the rod passing loosely through an aperture in a fixed plate 49 secured to the members 44, 45, and loosely through an aperture in a rotatable plate 50 hearing against the lower face of the plate 49 and having a pair of oppositcly positioned lugs 51, 52, having downi'urned ends 53. 54, adapted to simultaneously engage a pair of spring contact plates 55, 56. The plates 55. 56, are secured to one of the insulating members, as 45, by means of screws 57, E9, which constitute the binding posts for the line ter1uinals.

A wear plate 5?) is i'nonntcd agains the inne face of the plate 49, and a helical spring 60. coiled about the rod. 46. reacts lie-- tween this plate and the plate 4.8, its function being to return the push button after each inthrust. A wear and actuating plate the ( 1 bears against the lower face of the late fit), and is yieldiilgly held in contact, t erevcith by means of a spring 62, reacting against a plate 63 secured to the lower end of the rod. The plate 61 is slotted to engage the rod and turn with it, and is provided with a lag 64 for engaging back of the lugs 51, 52, and a pair of intermediate lugs 65, 66, formed on the plate 50.

The rod 46 is so formed that it oscillates the plate 61 through a quarter of a circle at each impulse of the push button, the plate 50 being carried forward with it, bringing its ends 53, 54, alternately into and out of engagement with the spring contact plates 55, 56. The inthrust ot' the push. button consequently alteri'iately rinses and opens the circuit, The plate 4% is provided on its ends with a pair of lugs (37, 68, entering longitudinal slots, as 69, in the side mombers o'f the casing 38, whereby turning movement of the plate 48 is prevented.

[xmgitudinal movement, of the rod 46 is prevented by forming thereon a pair of shoulders 70, 71, for engaging the Wear plate 5!). A detent 72, struck up on the. plate 49, is engaged successively by the lugs 51, 66, 52 and 65 as the. plate 50 is advanced, and prevents retrograde movement thereof, the plate at) being permitted. to yield slightly by the spring 62 in order that its-1 lugs may advance past this detent.

While a. preferred en'ihodiment of the invention is herein shown and described, various changes in the form and arrangement of parts can he made without departing from its scope.

I claim as my invention- 1. In an electric switch, in combination, a pair of terminals, a rotat-ive contact plate cooperating therewith, an oscillatahle actuab ing plate engageahle with the contact. plate, a rod in uon-rotative engagement with. the nscillatahle plate and having a spiral portion, and a reciprocating part fitting and slidable upon the spiral portion of the rod and means independent of said terminals for preventing reverse movement of the plate.

2. In an electric switch, in combination, an actuating rod, a non-rotative reciprocating element in sliding engagement therewith, one of said elements having a spiral formation, a rotative cohtact plate, means carried by the rod f0r"'interlocking with the, plate in one direction only of movement;

of the rod, a pair of termimds engageahle by the contact plate and means inde 'ielulent of said terminals for preventing reverse movement of ,the plate.

3. In an electric switch, in combination, a non-rotating reciprocating push-lnnton. a spiral plunger rotated thereby without IUl'll mention, a contact plate rotated intermittently by said spiral plunger, a pair of contacts engageable by the contact plate, eaid contact plateheing constructed to lie entirely out of mechanical contact with said contacts after alternate movements of the plate, and means independent of the cointacts for preventing reverse rotation of the contact plate.

4. In. an electric switch, incombination, a non-rotating reciprocating push-button, a spiral member rotated thereby without reciprocation, a Contact plate rotatable about a central axis. a IiOll-Xntatal'ile nawl plate yieldingly pressed against one side of said contaci plate adapted to prevent rotation of the latter in one direction, and a pawl plate ylelrhngly pressed against the other side of said ronlaut plate adapted when 09* uillatod about said axis by said spiral member to rotate the contact plate intermittently in the other direotion.

5. In an ulvotrio switch, in combination,

a uon-rohiting reciprocating push-button, a spiral member rotated thereby without reciprocation. a wilt-act plate rotatable about a central axis, a pawl plate oscillated by said. member about said axis on one side of movement of the latter in the opposite direution.

CARL BRAMMING. 

